Brake system
Description and roadside assistance
81
Guidelines for Breakdown Services (Subject to technical modifications)
i
Overview of compressed air reservoirs
Filling the compressed air system from an external source
The entire compressed-air system can only be filled from an external source via the tire inflation connection 1
or via the coupling head/filler connection
(see page 90). Filling the brake system with ancillary consumers
(except air suspension) from an external source requires a minimum pressure of 9 bar.
Vehicles with air suspension:
Filling the entire compressed air system requires a minimum pressure of about 10.5 bar.
Separate filling of the air suspension system (see page 90).
Tire inflation connection
The four-circuit protection valve and the compressed
air drier are usually located on the vehicle frame on
the left side.
On semitrailer tractors the four-circuit protection
valve and the compressed air drier may be installed
inside the frame. Detach any covers if necessary.
1 Compressed air reservoir, circuit 1
2 Separate compressed air reservoir
3 Compressed air reservoir, circuit 2
4 Compressed air drier
5 Compressed air reservoir, circuit 4
6 Four-circuit protection valve
7 Compressed air reservoir, circuit 3
1
21
22
1 Tire inflation connection
m Test connection, brake circuit 1
n Test connection, brake circuit 2
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